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IPTEK The Journal for Technology and Science
Published by Institut Teknologi Sepuluh Nopember Surabaya
ISSN : 08534098     EISSN : 20882033     DOI : -
Core Subject : Science,
Computer Science & IT
IPTEK The Journal for Technology and Science (eISSN: 2088-2033; Print ISSN:0853-4098), is an academic journal on the issued related to natural science and technology. The journal initially published four issues every year, i.e. February, May, August, and November. From 2014, IPTEK the Journal for Technology and Science publish three times a year, they are in April, August and December in online version.
Arjuna Subject : -
Articles 5 Documents
 1 
Search results for , issue "Vol 20, No 1 (2009)" : 5 Documents clear
Simulation Characteristics Continous Variable Transmission of Motor Cycle using Torque Control Based Fuzzy Logic Ary Subagya; I.K.A. Atmika
IPTEK The Journal for Technology and Science Vol 20, No 1 (2009)
Publisher : IPTEK, LPPM, Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j20882033.v20i1.132

Abstract

CVT is gear less transmission that was implemented on the motor cycle, it is purpose to increase handling of vehicle. In this case, gear less transmission developed by traction control using the fuzzy logic controller from the Mat-Lab soft wear. It modelled by simulation with gear ratio, speed, and traction toward acceleration (a), time (t), distance (s), and grade ability (G). The conclusion, the characteristic of torque control on gear less transmission of vehicle was increase handling toward acceleration (a), time (t), distance (s), and grade ability (G).
The Expert Control Designing of Tanker Ship Maneuvering by Optimal Control as a Reference Model Aulia S. Aisjah
IPTEK The Journal for Technology and Science Vol 20, No 1 (2009)
Publisher : IPTEK, LPPM, Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j20882033.v20i1.133

Abstract

Fuzzy logic control (FLC) system is a control system which is working based on error input data, rate of error, and accelaret of error of controlling variable. Using some rules of FAM (Fuzzy Associate Memory) which is constructed for resulting a decision can be used to actuator of controller. This paper is des-cribing about designing fuzzy logic as a control system for ship maneuvering, which is input for FLC are yaw error, yaw rate, and tracking error while the output of fuzzy logic control is command rudder signal. FLC con-sists of two units of controller; it is first controller unit work for autopilot and second controller unit for offset track. Interference function for FLC is Sugeno – Takagi which represent mathematic equation from input vari-able of FLC. Gain control of FLC based on least square estimation of error yaw, yaw rate, and output control signal relationship from LQR/LTR as a model reference control. Dynamic model of ship maneuvering has been derived on 3 dof with Clarke hydrodynamic coefficient. The capability of logic fuzzy control has been shown on simulation, for tanker ship model without interference or within interference. Robust of fuzzy logic control has been got from trajectory convergence error of yaw and yaw rate error when on turning simulation or off turning simulation toward the sector (0, 0).
Ethnobotanical and Plant Profile Studies at Karimunjawa Village of Jepara Regency, Central Java Nurhidayati, Tutik; Saptarini, Dian; Jadid, Nurul
IPTEK The Journal for Technology and Science Vol 20, No 1 (2009)
Publisher : IPTEK, LPPM, Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j20882033.v20i1.130

Abstract

Ethnobotanical and plant profile studies that had been conducted at Karimunajawa Village of Jepara Regency were aimed to elucidate plants used by the Karimunjawa villagers and typical plants of the Karimunjawa as well as their usage. The method used for this study was questionnaire, structured and semi-structured interviews. Conditions of Karimunjawa typi-cal plants in their natural habitats were measured through bell transects that were determined based on questionnaire previously filled by the villagers. Results of the study showed that there were 39 species of wild and cultivated plants used by villagers. The plants were used for building materials (39.77%), food (23.86%), handi-craft and souvenir (23.29%), furniture (5.11%), ship construction (3.40%), medicine (2.84%), and fuel wood (1.70%). There were three species of typical plants found in the Karimunjawa Islands, i.e. Dewadaru (Fragraea elliptica), Setigi (Pemphis acidula), and Kalimasada (Cordia subcordata). Profile of the typical plants indica-ted that at the Karimunjawa Village there were sixty four individual Dewadaru and two Setigi in their narural habitats. However, no Kalimasada was found in its origi-nal habitat; the Kalimasada found in this area was that of previously planted.
Development of New Rendemen Formula as an Effort to Control the Performance of Sugar Factory Bambang A. Santoso; Toto Martoyo; Subhanuel Bahri
IPTEK The Journal for Technology and Science Vol 20, No 1 (2009)
Publisher : IPTEK, LPPM, Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j20882033.v20i1.134

Abstract

Based on the data of sugar factory performance in Java during 1936-1940 and 1956-2000 milling season periods, there are three important factors that can control contribution of each sector at sugar fac-tory and absolutely affect targeted rendemen. Those fac-tors include cane pol in the field, harvesting efficiency and factory efficiency. Cane pol in the field is a result of plantation sector performance. Harvesting efficiency re-presents the performance of harvesting sector, while fac-tory efficiency has relationship with the performance of factory itself. In this research, the standard of factory performance was the data of factory performance in the milling season from 1936 to 1940 and the factory perfor-mance tested was the data of factory performance in the 1956-2000 milling season period. The aim of this research was to obtain a formula of rendemen calculation that represents a performance of all production aspects at sugar factory. The formula used for rendemen calculati-on was Rendemen (%) = cane pol in the field (%) x har-vesting efficiency (%) x factory efficiency (%) x 10-4. By using this concept, it is expected that targeted rendemen can be achieved since this concept can control all stages of production using the standard of each production aspect.
Experimental Investigation on Size Effect in Shear of High-Strength Concrete Beams Tavio, Tavio
IPTEK The Journal for Technology and Science Vol 20, No 1 (2009)
Publisher : IPTEK, LPPM, Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j20882033.v20i1.131

Abstract

In this paper, an experimental program on the size effect in high-strength reinforced concrete beams is described. A total of 18 deep and slender specimens with effective depth d ranging from 200 to 700 mm and shear span a ranging from 400 to 2450 mm were tested to failure under two-point symmetric top loading. Test variables were shear span to effective depth ratio a/d, web reinforcement percentage and the effective depth d. The compressive cylinder strengths f1 c of the beams vary from 75 to 104 MPa. The beams had the main steel ratio of 3.98 percent. Test results reveal that the ultimate shear stress is size dependent. Besides the shear span to effective depth ratio a/d, the effective depth d also has a significant influence on the failure mode and the ultimate shear stress; larger deep beams are more brittle in comparison with smaller ones. The 18 test results are then compared with predictions from the current ACI Code, Zsutty’s equation, Bazant’s method, and Strutand- Tie model. Comparison study shows that while the safety of the ACI Code and Zsutty’s equation reduces for larger concrete beams, Bazant’s equation predicts well the trend on the influence of effective depth d in highstrength concrete beams. The Strut-and-Tie model can predict the trend on the influence of effective depth in high-strength concrete deep beams, but overestimates the shear capacities of the beams.

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